API: map() on Index returns an Index, not array#14506

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nateyoder wants to merge 11 commits intopandas-dev:masterfrom

nateyoder:index_map_index

Commits on Dec 16, 2016

make map return an index if it operates on an index, multi index, or categorical index; map on a categorical will either return a categorical or an index (rather than a numpy array)
nateyoder
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introspect results from map so that if the output array has tuples we create a multiindex instead of an index
nateyoder
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make map on time tseries indices return index if dtype of output is not a tseries; sphinx changes; fix docstring
nateyoder
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use the numpy results if we can to avoid repeating the computation just to create the object
nateyoder
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Update tests to match dtype int64
nateyoder
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Fix tests that weren't run by PyCharm
nateyoder
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Update whatsnew and add git PR to tests to denote changes
nateyoder
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Fix unused import and docstrings per pep8radius docformatter; change other uses of assert_index_equal to testing instead os self
nateyoder
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compare as index
nateyoder
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update whatsnew, fix documentation
nateyoder
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fix typo and add ref tag in whatsnew
nateyoder
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